It is absorbent.
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We use non absorbent cotton for plugging of test tubes or other glassware. If we would use absorbent cotton then during sterilization (autoclaving) sterile conditions will not be maintained as cotton will absorb water and microbes will swim from outside to inside. However, non absorbent cotton does not get wet and chances of contamination are decreased significantly.
Sponge and cotton are absorbent.
Cotton is a very absorbent cloth.
Cotton wool is raw cotton with major impurities removed, usually used for surgical dressings, tampons and so forth -- highly absorbent cotton.
It is not completely flame resistant, but it is more flame resistant than most other materials- cotton burns extremely fast and synthetic fabrics melt.